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26 Jul 2021, 06:17
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
52% (02:59) correct
48%
(02:39)
wrong
based on 104
sessions
History
Date
Time
Result
Not Attempted Yet
An aquarium contains a variety of tropical fish. Is the ratio of the number of reef stonefish to the number of tetra fish in the aquarium
greater than 1 to 22?
1) The number of tetra fish in the aquarium is less than 40 greater than the number of reef stonefish in the aquarium.
2) If 2 new reef stonefish were added to the aquarium, the ratio of the number of reef stonefish to the number of tetra fish in the aquarium would be greater than 1 to 11.
greater than 1 to 22?
1) The number of tetra fish in the aquarium is less than 40 greater than the number of reef stonefish in the aquarium.
2) If 2 new reef stonefish were added to the aquarium, the ratio of the number of reef stonefish to the number of tetra fish in the aquarium would be greater than 1 to 11.
26 Jul 2021, 07:32
Kudos
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Quote:
Hmmm, okay, reading the question, I do notice that a '1 to 22' ratio is a pretty decent spread for the GMAT.
Statement 1 tells me the different is <40. Well... I could have 1 reef and 2 tetra, and that's a 1:2 ratio, so the answer would be yes. Or I could have 1 reef and 23 tetra, and that's a 1:23 ratio, so the answer would be no. Both cases have a difference of less than 40.
Eliminate A/D
Statement 2 says that if 2 reef are added, the ratio would be > 1:11.
So this means (R+2)/S > 1/11
Which means 11R + 22 > S
Which means S - 11R < 22...
Hmmm, So R could be 2 and S could be 23 (and 2:23 > 1:22, so the answer would be 'yes')
Or r could be 1 and S could be 30, and 1:30 < 1:22, so the answer could be 'no.'
Eliminate B.
Honestly at this point I've spent enough time and I would guess. In general, I err sufficient, especially when a question seems kind of complicated and tedious, so I'd guess 'C'.
Now, I'll figure out if that is correct...
And I realize, D'oh, the cases I tested for statement 2 were perfectly consistent with statement 1--the difference in fish was <40 for both cases in statement 2. So the answer must be E. So I missed it. Oh well. This doesn't mean 'err sufficient' isn't still the better advice, BUT, there is a takeaway here I should remind myself of:
Check to see if the cases you use in one statement are applicable cases in the other statement (or can be easily 'tweaked'). It's probably also good advice, if I decide I need to guess between C and E as I did here, to just check if my statements already fit both statements. While I was running long and needed to guess, the extra 10 seconds of care would have gotten a right answer instead of a wrong answer.
09 Feb 2026, 10:27
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Automated notice from GMAT Club BumpBot:
A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.
This post was generated automatically.
A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.
This post was generated automatically.
